From: Jiang Liu <[email protected]> This patch implements some utility funcitons to support system device hotplug.
Signed-off-by: Jiang Liu <[email protected]> Signed-off-by: Hanjun Guo <[email protected]> --- drivers/acpi/hotplug/core.c | 80 +++++++++++++++++++++++++++++++++++++++++++ include/acpi/acpi_hotplug.h | 9 +++++ 2 files changed, 89 insertions(+) diff --git a/drivers/acpi/hotplug/core.c b/drivers/acpi/hotplug/core.c index 5e78867..230375e 100644 --- a/drivers/acpi/hotplug/core.c +++ b/drivers/acpi/hotplug/core.c @@ -634,6 +634,86 @@ int acpihp_remove_device_list(struct klist *dev_list) } EXPORT_SYMBOL_GPL(acpihp_remove_device_list); +bool acpihp_slot_present(struct acpihp_slot *slot) +{ + acpi_status status; + unsigned long long sta; + + /* A hotplug slot must implement ACPI _STA method */ + status = acpi_evaluate_integer(slot->handle, + METHOD_NAME__STA, NULL, &sta); + if (ACPI_FAILURE(status)) { + ACPIHP_WARN("fails to evaluate _STA for %p.\n", slot->name); + return false; + } + + return !!(sta & ACPI_STA_DEVICE_PRESENT); +} +EXPORT_SYMBOL_GPL(acpihp_slot_present); + +bool acpihp_slot_powered(struct acpihp_slot *slot) +{ + acpi_status status; + unsigned long long sta; + + /* hotplug slot must implement _STA method */ + status = acpi_evaluate_integer(slot->handle, + METHOD_NAME__STA, NULL, &sta); + if (ACPI_FAILURE(status)) { + ACPIHP_WARN("fails to evaluate _STA for %p.\n", slot->name); + return false; + } + + if ((sta & ACPI_STA_DEVICE_PRESENT) && + ((sta & ACPI_STA_DEVICE_ENABLED) || + (sta & ACPI_STA_DEVICE_FUNCTIONING))) + return true; + + return false; +} +EXPORT_SYMBOL_GPL(acpihp_slot_powered); + +void acpihp_slot_set_flag(struct acpihp_slot *slot, u32 flags) +{ + mutex_lock(&slot->slot_mutex); + slot->flags |= flags; + mutex_unlock(&slot->slot_mutex); +} +EXPORT_SYMBOL_GPL(acpihp_slot_set_flag); + +void acpihp_slot_clear_flag(struct acpihp_slot *slot, u32 flags) +{ + mutex_lock(&slot->slot_mutex); + slot->flags &= ~flags; + mutex_unlock(&slot->slot_mutex); +} +EXPORT_SYMBOL_GPL(acpihp_slot_clear_flag); + +u32 acpihp_slot_get_flag(struct acpihp_slot *slot, u32 flags) +{ + mutex_lock(&slot->slot_mutex); + flags &= slot->flags; + mutex_unlock(&slot->slot_mutex); + + return flags; +} +EXPORT_SYMBOL_GPL(acpihp_slot_get_flag); + +void acpihp_slot_change_state(struct acpihp_slot *slot, + enum acpihp_slot_state state) +{ + if (state < ACPIHP_SLOT_STATE_UNKNOWN || + state > ACPIHP_SLOT_STATE_MAX) { + ACPIHP_WARN("slot state %d is invalid.\n", state); + BUG_ON(state); + } + + mutex_lock(&slot->slot_mutex); + slot->state = state; + mutex_unlock(&slot->slot_mutex); +} +EXPORT_SYMBOL_GPL(acpihp_slot_change_state); + /* SYSFS interfaces */ static ssize_t acpihp_slot_object_show(struct device *d, struct device_attribute *attr, char *buf) diff --git a/include/acpi/acpi_hotplug.h b/include/acpi/acpi_hotplug.h index 1d43079..a13d9f0 100644 --- a/include/acpi/acpi_hotplug.h +++ b/include/acpi/acpi_hotplug.h @@ -289,6 +289,15 @@ extern int acpihp_slot_remove_device(struct acpihp_slot *slot, struct device *dev); extern int acpihp_remove_device_list(struct klist *dev_list); +/* Utility Functions */ +extern bool acpihp_slot_present(struct acpihp_slot *slot); +extern bool acpihp_slot_powered(struct acpihp_slot *slot); +extern void acpihp_slot_set_flag(struct acpihp_slot *slot, u32 flags); +extern void acpihp_slot_clear_flag(struct acpihp_slot *slot, u32 flags); +extern u32 acpihp_slot_get_flag(struct acpihp_slot *slot, u32 flags); +extern void acpihp_slot_change_state(struct acpihp_slot *slot, + enum acpihp_slot_state state); + extern int acpihp_debug; #define ACPIHP_DEBUG(fmt, ...) \ -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
